package com.vates.curso.dao.imp;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.hibernate3.HibernateTemplate;

import com.vates.curso.dao.GenericDao;

/**
 * This class serves as the Base class for all other DAOs - namely to hold
 * common CRUD methods that they might all use. You should only need to extend
 * this class when your require custom CRUD logic.
 * <p/>
 * <p>
 * To register this class in your Spring context file, use the following XML.
 * 
 * <pre>
 *      &lt;bean id="fooDao" class="org.appfuse.dao.hibernate.GenericDaoHibernate"&gt;
 *          &lt;constructor-arg value="org.appfuse.model.Foo"/&gt;
 *      &lt;/bean&gt;
 * </pre>
 * 
 * @author <a href="mailto:bwnoll@gmail.com">Bryan Noll</a>
 * @param <T>
 *            a type variable
 * @param <PK>
 *            the primary key for that type
 */
public abstract class GenericDaoHibernate2<T, PK extends Serializable>
		implements GenericDao<T, PK> {
	/**
	 * Log variable for all child classes. Uses LogFactory.getLog(getClass())
	 * from Commons Logging
	 */
	protected final Log log = LogFactory.getLog(getClass());
	private Class<T> persistentClass;
	private HibernateTemplate hibernateTemplate;
	private SessionFactory sessionFactory;

	/**
	 * Constructor that takes in a class to see which type of entity to persist.
	 * Use this constructor when subclassing.
	 * 
	 * @param persistentClass
	 *            the class type you'd like to persist
	 */
	public GenericDaoHibernate2(final Class<T> persistentClass) {
		this.persistentClass = persistentClass;
	}

	/**
	 * Constructor that takes in a class and sessionFactory for easy creation of
	 * DAO.
	 * 
	 * @param persistentClass
	 *            the class type you'd like to persist
	 * @param sessionFactory
	 *            the pre-configured Hibernate SessionFactory
	 */
	public GenericDaoHibernate2(final Class<T> persistentClass,
			SessionFactory sessionFactory) {
		this.persistentClass = persistentClass;
		this.sessionFactory = sessionFactory;
		this.hibernateTemplate = new HibernateTemplate(sessionFactory);
	}

	public HibernateTemplate getHibernateTemplate() {
		return this.hibernateTemplate;
	}

	public SessionFactory getSessionFactory() {
		return this.sessionFactory;
	}

	@Autowired
	@Required
	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
		this.hibernateTemplate = new HibernateTemplate(sessionFactory);
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public List<T> getAll() {
		return hibernateTemplate.loadAll(this.persistentClass);
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public List<T> getAllDistinct() {
		Collection result = new LinkedHashSet(getAll());
		return new ArrayList(result);
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public T get(PK id) {
		T entity = (T) hibernateTemplate.get(this.persistentClass, id);

		if (entity == null) {
			log.warn("Uh oh, '" + this.persistentClass + "' object with id '"
					+ id + "' not found...");
			throw new ObjectRetrievalFailureException(this.persistentClass, id);
		}

		return entity;
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public boolean exists(PK id) {
		T entity = (T) hibernateTemplate.get(this.persistentClass, id);
		return entity != null;
	}

	/**
	 * {@inheritDoc}
	 */
	// @SuppressWarnings("unchecked")
	// public T save(T object) {
	// return (T) hibernateTemplate.merge(object);
	// }

	/**
	 * {@inheritDoc}
	 */
	public void remove(PK id) {
		hibernateTemplate.delete(this.get(id));
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public List<T> findByNamedQuery(String queryName,
			Map<String, Object> queryParams) {
		String[] params = new String[queryParams.size()];
		Object[] values = new Object[queryParams.size()];

		int index = 0;
		for (String s : queryParams.keySet()) {
			params[index] = s;
			values[index++] = queryParams.get(s);
		}

		return hibernateTemplate.findByNamedQueryAndNamedParam(queryName,
				params, values);
	}

	public void update(T entity) {
		// TODO Auto-generated method stub

	}

	public List<T> executeSQLQuery(String sqlQuery) {
		// TODO Auto-generated method stub
		return null;
	}

}
